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European Definitions

Availability is a measure of time during which a generating unit, transmission line, ancillary service or another facility is capable of providing service, whether or not it actually is in service. [1]

National Definitions


The state of being accessible and usable in a timely and reliable manner.
Condition d’être accessible et utilisable de manière fiable et en temps opportun. [2]

Czech Republic

Property of availability and usability at the request of an authorized entity (Vlastnost přístupnosti a použitelnosti na žádost autorizované entity). [3]

United States

Ensuring timely and reliable access to and use of information. [4]

The property of being accessible and useable upon demand by an authorized entity. [4]

Standard Definition

ISO/IEC 27000:2014

Property of being accessible and usable upon demand by an authorized entity[5].

See also